Source: The Collaborative International Dictionary of English v.0.48
Megalopolis \Meg`a*lop"o*lis\, Megapolis
\Meg`a"po*lis\(m[e^]g`[.a]*l[o^]p"[-o]*l[i^]s), n. [NL., fr. Gr.
megalo`polis; me`gas, mega`lh, great + po`lis city.]
1. A chief city; a very large cuity; a metropolis.
[1913 Webster]
2. A region in which the suburbs of several large cities
merge to form one large predominantly urbanized area.
[PJC]